1 /*
2 * H.263 decoder
3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * H.263 decoder.
26 */
27
28 #define UNCHECKED_BITSTREAM_READER 1
29
30 #include "libavutil/cpu.h"
31 #include "avcodec.h"
32 #include "error_resilience.h"
33 #include "flv.h"
34 #include "h263.h"
35 #include "h263_parser.h"
36 #include "hwconfig.h"
37 #include "internal.h"
38 #include "mpeg_er.h"
39 #include "mpeg4video.h"
40 #include "mpeg4video_parser.h"
41 #include "mpegutils.h"
42 #include "mpegvideo.h"
43 #include "msmpeg4.h"
44 #include "qpeldsp.h"
45 #include "thread.h"
46 #include "wmv2.h"
47
h263_get_format(AVCodecContext * avctx)48 static enum AVPixelFormat h263_get_format(AVCodecContext *avctx)
49 {
50 /* MPEG-4 Studio Profile only, not supported by hardware */
51 if (avctx->bits_per_raw_sample > 8) {
52 av_assert1(((MpegEncContext *)avctx->priv_data)->studio_profile);
53 return avctx->pix_fmt;
54 }
55
56 if (avctx->codec->id == AV_CODEC_ID_MSS2)
57 return AV_PIX_FMT_YUV420P;
58
59 if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY)) {
60 if (avctx->color_range == AVCOL_RANGE_UNSPECIFIED)
61 avctx->color_range = AVCOL_RANGE_MPEG;
62 return AV_PIX_FMT_GRAY8;
63 }
64
65 return avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
66 }
67
ff_h263_decode_init(AVCodecContext * avctx)68 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
69 {
70 MpegEncContext *s = avctx->priv_data;
71 int ret;
72
73 s->out_format = FMT_H263;
74
75 // set defaults
76 ff_mpv_decode_defaults(s);
77 ff_mpv_decode_init(s, avctx);
78
79 s->quant_precision = 5;
80 s->decode_mb = ff_h263_decode_mb;
81 s->low_delay = 1;
82 s->unrestricted_mv = 1;
83
84 /* select sub codec */
85 switch (avctx->codec->id) {
86 case AV_CODEC_ID_H263:
87 case AV_CODEC_ID_H263P:
88 s->unrestricted_mv = 0;
89 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
90 break;
91 case AV_CODEC_ID_MPEG4:
92 break;
93 case AV_CODEC_ID_MSMPEG4V1:
94 s->h263_pred = 1;
95 s->msmpeg4_version = 1;
96 break;
97 case AV_CODEC_ID_MSMPEG4V2:
98 s->h263_pred = 1;
99 s->msmpeg4_version = 2;
100 break;
101 case AV_CODEC_ID_MSMPEG4V3:
102 s->h263_pred = 1;
103 s->msmpeg4_version = 3;
104 break;
105 case AV_CODEC_ID_WMV1:
106 s->h263_pred = 1;
107 s->msmpeg4_version = 4;
108 break;
109 case AV_CODEC_ID_WMV2:
110 s->h263_pred = 1;
111 s->msmpeg4_version = 5;
112 break;
113 case AV_CODEC_ID_VC1:
114 case AV_CODEC_ID_WMV3:
115 case AV_CODEC_ID_VC1IMAGE:
116 case AV_CODEC_ID_WMV3IMAGE:
117 case AV_CODEC_ID_MSS2:
118 s->h263_pred = 1;
119 s->msmpeg4_version = 6;
120 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
121 break;
122 case AV_CODEC_ID_H263I:
123 break;
124 case AV_CODEC_ID_FLV1:
125 s->h263_flv = 1;
126 break;
127 default:
128 av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
129 avctx->codec->id);
130 return AVERROR(ENOSYS);
131 }
132 s->codec_id = avctx->codec->id;
133
134 if (avctx->codec_tag == AV_RL32("L263") || avctx->codec_tag == AV_RL32("S263"))
135 if (avctx->extradata_size == 56 && avctx->extradata[0] == 1)
136 s->ehc_mode = 1;
137
138 /* for H.263, we allocate the images after having read the header */
139 if (avctx->codec->id != AV_CODEC_ID_H263 &&
140 avctx->codec->id != AV_CODEC_ID_H263P &&
141 avctx->codec->id != AV_CODEC_ID_MPEG4) {
142 avctx->pix_fmt = h263_get_format(avctx);
143 ff_mpv_idct_init(s);
144 if ((ret = ff_mpv_common_init(s)) < 0)
145 return ret;
146 }
147
148 ff_h263dsp_init(&s->h263dsp);
149 ff_qpeldsp_init(&s->qdsp);
150 ff_h263_decode_init_vlc();
151
152 return 0;
153 }
154
ff_h263_decode_end(AVCodecContext * avctx)155 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
156 {
157 MpegEncContext *s = avctx->priv_data;
158
159 ff_mpv_common_end(s);
160 return 0;
161 }
162
163 /**
164 * Return the number of bytes consumed for building the current frame.
165 */
get_consumed_bytes(MpegEncContext * s,int buf_size)166 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
167 {
168 int pos = (get_bits_count(&s->gb) + 7) >> 3;
169
170 if (s->divx_packed || s->avctx->hwaccel) {
171 /* We would have to scan through the whole buf to handle the weird
172 * reordering ... */
173 return buf_size;
174 } else if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
175 pos -= s->parse_context.last_index;
176 // padding is not really read so this might be -1
177 if (pos < 0)
178 pos = 0;
179 return pos;
180 } else {
181 // avoid infinite loops (maybe not needed...)
182 if (pos == 0)
183 pos = 1;
184 // oops ;)
185 if (pos + 10 > buf_size)
186 pos = buf_size;
187
188 return pos;
189 }
190 }
191
decode_slice(MpegEncContext * s)192 static int decode_slice(MpegEncContext *s)
193 {
194 const int part_mask = s->partitioned_frame
195 ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
196 const int mb_size = 16 >> s->avctx->lowres;
197 int ret;
198
199 s->last_resync_gb = s->gb;
200 s->first_slice_line = 1;
201 s->resync_mb_x = s->mb_x;
202 s->resync_mb_y = s->mb_y;
203
204 ff_set_qscale(s, s->qscale);
205
206 if (s->studio_profile) {
207 if ((ret = ff_mpeg4_decode_studio_slice_header(s->avctx->priv_data)) < 0)
208 return ret;
209 }
210
211 if (s->avctx->hwaccel) {
212 const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
213 ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
214 // ensure we exit decode loop
215 s->mb_y = s->mb_height;
216 return ret;
217 }
218
219 if (s->partitioned_frame) {
220 const int qscale = s->qscale;
221
222 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
223 if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
224 return ret;
225
226 /* restore variables which were modified */
227 s->first_slice_line = 1;
228 s->mb_x = s->resync_mb_x;
229 s->mb_y = s->resync_mb_y;
230 ff_set_qscale(s, qscale);
231 }
232
233 for (; s->mb_y < s->mb_height; s->mb_y++) {
234 /* per-row end of slice checks */
235 if (s->msmpeg4_version) {
236 if (s->resync_mb_y + s->slice_height == s->mb_y) {
237 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
238 s->mb_x - 1, s->mb_y, ER_MB_END);
239
240 return 0;
241 }
242 }
243
244 if (s->msmpeg4_version == 1) {
245 s->last_dc[0] =
246 s->last_dc[1] =
247 s->last_dc[2] = 128;
248 }
249
250 ff_init_block_index(s);
251 for (; s->mb_x < s->mb_width; s->mb_x++) {
252 int ret;
253
254 ff_update_block_index(s);
255
256 if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
257 s->first_slice_line = 0;
258
259 /* DCT & quantize */
260
261 s->mv_dir = MV_DIR_FORWARD;
262 s->mv_type = MV_TYPE_16X16;
263 ff_dlog(s, "%d %06X\n",
264 get_bits_count(&s->gb), show_bits(&s->gb, 24));
265
266 ff_tlog(NULL, "Decoding MB at %dx%d\n", s->mb_x, s->mb_y);
267 ret = s->decode_mb(s, s->block);
268
269 if (s->pict_type != AV_PICTURE_TYPE_B)
270 ff_h263_update_motion_val(s);
271
272 if (ret < 0) {
273 const int xy = s->mb_x + s->mb_y * s->mb_stride;
274 if (ret == SLICE_END) {
275 ff_mpv_reconstruct_mb(s, s->block);
276 if (s->loop_filter)
277 ff_h263_loop_filter(s);
278
279 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
280 s->mb_x, s->mb_y, ER_MB_END & part_mask);
281
282 s->padding_bug_score--;
283
284 if (++s->mb_x >= s->mb_width) {
285 s->mb_x = 0;
286 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
287 ff_mpv_report_decode_progress(s);
288 s->mb_y++;
289 }
290 return 0;
291 } else if (ret == SLICE_NOEND) {
292 av_log(s->avctx, AV_LOG_ERROR,
293 "Slice mismatch at MB: %d\n", xy);
294 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
295 s->mb_x + 1, s->mb_y,
296 ER_MB_END & part_mask);
297 return AVERROR_INVALIDDATA;
298 }
299 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
300 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
301 s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
302
303 if (s->avctx->err_recognition & AV_EF_IGNORE_ERR)
304 continue;
305 return AVERROR_INVALIDDATA;
306 }
307
308 ff_mpv_reconstruct_mb(s, s->block);
309 if (s->loop_filter)
310 ff_h263_loop_filter(s);
311 }
312
313 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
314 ff_mpv_report_decode_progress(s);
315
316 s->mb_x = 0;
317 }
318
319 av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height);
320
321 // Detect incorrect padding with wrong stuffing codes used by NEC N-02B
322 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
323 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
324 get_bits_left(&s->gb) >= 48 &&
325 show_bits(&s->gb, 24) == 0x4010 &&
326 !s->data_partitioning)
327 s->padding_bug_score += 32;
328
329 /* try to detect the padding bug */
330 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
331 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
332 get_bits_left(&s->gb) >= 0 &&
333 get_bits_left(&s->gb) < 137 &&
334 !s->data_partitioning) {
335 const int bits_count = get_bits_count(&s->gb);
336 const int bits_left = s->gb.size_in_bits - bits_count;
337
338 if (bits_left == 0) {
339 s->padding_bug_score += 16;
340 } else if (bits_left != 1) {
341 int v = show_bits(&s->gb, 8);
342 v |= 0x7F >> (7 - (bits_count & 7));
343
344 if (v == 0x7F && bits_left <= 8)
345 s->padding_bug_score--;
346 else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
347 bits_left <= 16)
348 s->padding_bug_score += 4;
349 else
350 s->padding_bug_score++;
351 }
352 }
353
354 if (s->codec_id == AV_CODEC_ID_H263 &&
355 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
356 get_bits_left(&s->gb) >= 8 &&
357 get_bits_left(&s->gb) < 300 &&
358 s->pict_type == AV_PICTURE_TYPE_I &&
359 show_bits(&s->gb, 8) == 0 &&
360 !s->data_partitioning) {
361
362 s->padding_bug_score += 32;
363 }
364
365 if (s->codec_id == AV_CODEC_ID_H263 &&
366 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
367 get_bits_left(&s->gb) >= 64 &&
368 AV_RB64(s->gb.buffer_end - 8) == 0xCDCDCDCDFC7F0000) {
369
370 s->padding_bug_score += 32;
371 }
372
373 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
374 if (
375 (s->padding_bug_score > -2 && !s->data_partitioning))
376 s->workaround_bugs |= FF_BUG_NO_PADDING;
377 else
378 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
379 }
380
381 // handle formats which don't have unique end markers
382 if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
383 int left = get_bits_left(&s->gb);
384 int max_extra = 7;
385
386 /* no markers in M$ crap */
387 if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I)
388 max_extra += 17;
389
390 /* buggy padding but the frame should still end approximately at
391 * the bitstream end */
392 if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
393 (s->avctx->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
394 max_extra += 48;
395 else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
396 max_extra += 256 * 256 * 256 * 64;
397
398 if (left > max_extra)
399 av_log(s->avctx, AV_LOG_ERROR,
400 "discarding %d junk bits at end, next would be %X\n",
401 left, show_bits(&s->gb, 24));
402 else if (left < 0)
403 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
404 else
405 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
406 s->mb_x - 1, s->mb_y, ER_MB_END);
407
408 return 0;
409 }
410
411 av_log(s->avctx, AV_LOG_ERROR,
412 "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
413 get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
414
415 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
416 ER_MB_END & part_mask);
417
418 return AVERROR_INVALIDDATA;
419 }
420
ff_h263_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)421 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
422 AVPacket *avpkt)
423 {
424 const uint8_t *buf = avpkt->data;
425 int buf_size = avpkt->size;
426 MpegEncContext *s = avctx->priv_data;
427 int ret;
428 int slice_ret = 0;
429 AVFrame *pict = data;
430
431 /* no supplementary picture */
432 if (buf_size == 0) {
433 /* special case for last picture */
434 if (s->low_delay == 0 && s->next_picture_ptr) {
435 if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
436 return ret;
437 s->next_picture_ptr = NULL;
438
439 *got_frame = 1;
440 }
441
442 return 0;
443 }
444
445 if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
446 int next;
447
448 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
449 next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
450 } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
451 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
452 } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) {
453 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
454 } else {
455 av_log(s->avctx, AV_LOG_ERROR,
456 "this codec does not support truncated bitstreams\n");
457 return AVERROR(ENOSYS);
458 }
459
460 if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
461 &buf_size) < 0)
462 return buf_size;
463 }
464
465 retry:
466 if (s->divx_packed && s->bitstream_buffer_size) {
467 int i;
468 for(i=0; i < buf_size-3; i++) {
469 if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
470 if (buf[i+3]==0xB0) {
471 av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
472 s->bitstream_buffer_size = 0;
473 }
474 break;
475 }
476 }
477 }
478
479 if (s->bitstream_buffer_size && (s->divx_packed || buf_size <= MAX_NVOP_SIZE)) // divx 5.01+/xvid frame reorder
480 ret = init_get_bits8(&s->gb, s->bitstream_buffer,
481 s->bitstream_buffer_size);
482 else
483 ret = init_get_bits8(&s->gb, buf, buf_size);
484
485 s->bitstream_buffer_size = 0;
486 if (ret < 0)
487 return ret;
488
489 if (!s->context_initialized)
490 // we need the idct permutation for reading a custom matrix
491 ff_mpv_idct_init(s);
492
493 /* let's go :-) */
494 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
495 ret = ff_wmv2_decode_picture_header(s);
496 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
497 ret = ff_msmpeg4_decode_picture_header(s);
498 } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
499 if (s->avctx->extradata_size && s->picture_number == 0) {
500 GetBitContext gb;
501
502 if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 )
503 ff_mpeg4_decode_picture_header(avctx->priv_data, &gb, 1);
504 }
505 ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb, 0);
506 } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
507 ret = ff_intel_h263_decode_picture_header(s);
508 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
509 ret = ff_flv_decode_picture_header(s);
510 } else {
511 ret = ff_h263_decode_picture_header(s);
512 }
513
514 if (ret < 0 || ret == FRAME_SKIPPED) {
515 if ( s->width != avctx->coded_width
516 || s->height != avctx->coded_height) {
517 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
518 s->width = avctx->coded_width;
519 s->height= avctx->coded_height;
520 }
521 }
522 if (ret == FRAME_SKIPPED)
523 return get_consumed_bytes(s, buf_size);
524
525 /* skip if the header was thrashed */
526 if (ret < 0) {
527 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
528 return ret;
529 }
530
531 if (!s->context_initialized) {
532 avctx->pix_fmt = h263_get_format(avctx);
533 if ((ret = ff_mpv_common_init(s)) < 0)
534 return ret;
535 }
536
537 if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
538 int i = ff_find_unused_picture(s->avctx, s->picture, 0);
539 if (i < 0)
540 return i;
541 s->current_picture_ptr = &s->picture[i];
542 }
543
544 avctx->has_b_frames = !s->low_delay;
545
546 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
547 if (ff_mpeg4_workaround_bugs(avctx) == 1)
548 goto retry;
549 if (s->studio_profile != (s->idsp.idct == NULL))
550 ff_mpv_idct_init(s);
551 }
552
553 /* After H.263 & MPEG-4 header decode we have the height, width,
554 * and other parameters. So then we could init the picture.
555 * FIXME: By the way H.263 decoder is evolving it should have
556 * an H263EncContext */
557 if (s->width != avctx->coded_width ||
558 s->height != avctx->coded_height ||
559 s->context_reinit) {
560 /* H.263 could change picture size any time */
561 s->context_reinit = 0;
562
563 ret = ff_set_dimensions(avctx, s->width, s->height);
564 if (ret < 0)
565 return ret;
566
567 ff_set_sar(avctx, avctx->sample_aspect_ratio);
568
569 if ((ret = ff_mpv_common_frame_size_change(s)))
570 return ret;
571
572 if (avctx->pix_fmt != h263_get_format(avctx)) {
573 av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
574 avctx->pix_fmt = AV_PIX_FMT_NONE;
575 return AVERROR_UNKNOWN;
576 }
577 }
578
579 if (s->codec_id == AV_CODEC_ID_H263 ||
580 s->codec_id == AV_CODEC_ID_H263P ||
581 s->codec_id == AV_CODEC_ID_H263I)
582 s->gob_index = H263_GOB_HEIGHT(s->height);
583
584 // for skipping the frame
585 s->current_picture.f->pict_type = s->pict_type;
586 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
587
588 /* skip B-frames if we don't have reference frames */
589 if (!s->last_picture_ptr &&
590 (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
591 return get_consumed_bytes(s, buf_size);
592 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
593 s->pict_type == AV_PICTURE_TYPE_B) ||
594 (avctx->skip_frame >= AVDISCARD_NONKEY &&
595 s->pict_type != AV_PICTURE_TYPE_I) ||
596 avctx->skip_frame >= AVDISCARD_ALL)
597 return get_consumed_bytes(s, buf_size);
598
599 if (s->next_p_frame_damaged) {
600 if (s->pict_type == AV_PICTURE_TYPE_B)
601 return get_consumed_bytes(s, buf_size);
602 else
603 s->next_p_frame_damaged = 0;
604 }
605
606 if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
607 s->me.qpel_put = s->qdsp.put_qpel_pixels_tab;
608 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
609 } else {
610 s->me.qpel_put = s->qdsp.put_no_rnd_qpel_pixels_tab;
611 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
612 }
613
614 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
615 return ret;
616
617 if (!s->divx_packed && !avctx->hwaccel)
618 ff_thread_finish_setup(avctx);
619
620 if (avctx->hwaccel) {
621 ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
622 s->gb.buffer_end - s->gb.buffer);
623 if (ret < 0 )
624 return ret;
625 }
626
627 ff_mpeg_er_frame_start(s);
628
629 /* the second part of the wmv2 header contains the MB skip bits which
630 * are stored in current_picture->mb_type which is not available before
631 * ff_mpv_frame_start() */
632 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
633 ret = ff_wmv2_decode_secondary_picture_header(s);
634 if (ret < 0)
635 return ret;
636 if (ret == 1)
637 goto frame_end;
638 }
639
640 /* decode each macroblock */
641 s->mb_x = 0;
642 s->mb_y = 0;
643
644 slice_ret = decode_slice(s);
645 while (s->mb_y < s->mb_height) {
646 if (s->msmpeg4_version) {
647 if (s->slice_height == 0 || s->mb_x != 0 || slice_ret < 0 ||
648 (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
649 break;
650 } else {
651 int prev_x = s->mb_x, prev_y = s->mb_y;
652 if (ff_h263_resync(s) < 0)
653 break;
654 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
655 s->er.error_occurred = 1;
656 }
657
658 if (s->msmpeg4_version < 4 && s->h263_pred)
659 ff_mpeg4_clean_buffers(s);
660
661 if (decode_slice(s) < 0)
662 slice_ret = AVERROR_INVALIDDATA;
663 }
664
665 if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
666 s->pict_type == AV_PICTURE_TYPE_I)
667 if (!CONFIG_MSMPEG4_DECODER ||
668 ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
669 s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
670
671 av_assert1(s->bitstream_buffer_size == 0);
672 frame_end:
673 if (!s->studio_profile)
674 ff_er_frame_end(&s->er);
675
676 if (avctx->hwaccel) {
677 ret = avctx->hwaccel->end_frame(avctx);
678 if (ret < 0)
679 return ret;
680 }
681
682 ff_mpv_frame_end(s);
683
684 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
685 ff_mpeg4_frame_end(avctx, buf, buf_size);
686
687 if (!s->divx_packed && avctx->hwaccel)
688 ff_thread_finish_setup(avctx);
689
690 av_assert1(s->current_picture.f->pict_type == s->current_picture_ptr->f->pict_type);
691 av_assert1(s->current_picture.f->pict_type == s->pict_type);
692 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
693 if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
694 return ret;
695 ff_print_debug_info(s, s->current_picture_ptr, pict);
696 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
697 } else if (s->last_picture_ptr) {
698 if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
699 return ret;
700 ff_print_debug_info(s, s->last_picture_ptr, pict);
701 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
702 }
703
704 if (s->last_picture_ptr || s->low_delay) {
705 if ( pict->format == AV_PIX_FMT_YUV420P
706 && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
707 int x, y, p;
708 av_frame_make_writable(pict);
709 for (p=0; p<3; p++) {
710 int w = AV_CEIL_RSHIFT(pict-> width, !!p);
711 int h = AV_CEIL_RSHIFT(pict->height, !!p);
712 int linesize = pict->linesize[p];
713 for (y=0; y<(h>>1); y++)
714 for (x=0; x<w; x++)
715 FFSWAP(int,
716 pict->data[p][x + y*linesize],
717 pict->data[p][x + (h-1-y)*linesize]);
718 }
719 }
720 *got_frame = 1;
721 }
722
723 if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
724 return slice_ret;
725 else
726 return get_consumed_bytes(s, buf_size);
727 }
728
729 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
730 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
731 AV_PIX_FMT_VAAPI,
732 #endif
733 #if CONFIG_MPEG4_NVDEC_HWACCEL
734 AV_PIX_FMT_CUDA,
735 #endif
736 #if CONFIG_MPEG4_VDPAU_HWACCEL
737 AV_PIX_FMT_VDPAU,
738 #endif
739 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL || CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
740 AV_PIX_FMT_VIDEOTOOLBOX,
741 #endif
742 AV_PIX_FMT_YUV420P,
743 AV_PIX_FMT_NONE
744 };
745
746 const AVCodecHWConfigInternal *ff_h263_hw_config_list[] = {
747 #if CONFIG_H263_VAAPI_HWACCEL
748 HWACCEL_VAAPI(h263),
749 #endif
750 #if CONFIG_MPEG4_NVDEC_HWACCEL
751 HWACCEL_NVDEC(mpeg4),
752 #endif
753 #if CONFIG_MPEG4_VDPAU_HWACCEL
754 HWACCEL_VDPAU(mpeg4),
755 #endif
756 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL
757 HWACCEL_VIDEOTOOLBOX(h263),
758 #endif
759 NULL
760 };
761
762 AVCodec ff_h263_decoder = {
763 .name = "h263",
764 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
765 .type = AVMEDIA_TYPE_VIDEO,
766 .id = AV_CODEC_ID_H263,
767 .priv_data_size = sizeof(MpegEncContext),
768 .init = ff_h263_decode_init,
769 .close = ff_h263_decode_end,
770 .decode = ff_h263_decode_frame,
771 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
772 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY,
773 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
774 .flush = ff_mpeg_flush,
775 .max_lowres = 3,
776 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
777 .hw_configs = ff_h263_hw_config_list,
778 };
779
780 AVCodec ff_h263p_decoder = {
781 .name = "h263p",
782 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
783 .type = AVMEDIA_TYPE_VIDEO,
784 .id = AV_CODEC_ID_H263P,
785 .priv_data_size = sizeof(MpegEncContext),
786 .init = ff_h263_decode_init,
787 .close = ff_h263_decode_end,
788 .decode = ff_h263_decode_frame,
789 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
790 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY,
791 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
792 .flush = ff_mpeg_flush,
793 .max_lowres = 3,
794 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
795 .hw_configs = ff_h263_hw_config_list,
796 };
797